Sub expression not working in Flow action

[Sutekh666]

Afternoon all

I've got a Flow where I'm trying to subtract the value from a field called 'Qty' in one list from a value in a field called 'Test qty' in a different as shown below:

However expression isn't subtracting the values. This is the output from the tests I've run:

Where am I going wrong? All help appreciated!

[Expiscornovus · Accepted solution]

Hi @Sutekh666,

Can you remove the single quotation mark characters around the Qty and Test qty variables in your expression?

It will think you are trying to subtract strings instead of integer or float values. using the sub function for strings is not supported. This should work:

sub(0,20)